Good Omens and everything related to it belongs to Neil Gaiman and Terry Pratchett.
The original idea of creating a lexicon of information about a (series of) novel(s) comes from the Harry Potter Lexicon.
The font used in the page headings is Another Typewriter by Johan Holmdal, available at dafont.com.
The art in the header images is by the following artists:
Linn: The Them, Aziraphale
Squeaky: Crowley & Aziraphale
Meghan: War
